Within light sensing optoelectronic devices, multijunction organic and hybrid photodetectors show a large potential. In particular, organic and hybrid phototransistors hold promises for high-sensitivity thanks to their inherent signal-amplification characteristics. However, often a trade-off between a large sensing area, a fast response, and a high specific detectivity is difficult to be achieved. Here we propose an alternative phototransistor concept, that relies on a geometrically engineered large area tri-channel architecture, applied to a multilayer hybrid phototransistor composed of an inorganic In2O3/ZnO n-type field-effect channel, and a top organic bulk-heterojunction or hybrid perovskite light-sensing layer. Up-scalable solution-processing of both the field-effect channel and the light-sensing layers are implemented. Different photoactive layers are used to corroborate and validate the proposed concept. The resulting phototransistor combines the characteristics of easy solution processing, a maximum responsivity of 10^5 A/W thanks to the large electron mobility of the In2O3/ZnO heterointerface, and a maximum specific detectivity of 10^15Jones (at a low gate voltage of 5V and under a low light illumination of 10 nW/cm2), thanks to the large sensing area which is fully exploited in the tri-channel architecture. The improved photoresponse characteristics are accompanied by a fast response (risetime <10ms down to the uW/cm2 of illumination), which is comparable to the time-response of analogous phototransistors in the conventional architecture. The experimental data are supported by device modelling, which helps highlighting the peculiar advantages of the proposed large area, tri-channel and multi-junction phototransistor architecture.
Despite fluorescent sensing is a reference method for the detection of a plethora of different compounds, the exploitation of this class of sensors is still limited to a few application scenarios as a result of the restricted availability of miniaturized, portable, and user-friendly devices.
Here, the smart combination of an organic photodiode (OPD), a Distributed Bragg Filter (DBR), and an organic light-emitting diode (OLED) is proven to provide a stacked device architecture capable of detecting fluorescent signals for a wide range of concentrations of “Rhodamine 700” ranging from 10-3 M to 10-6 M.
Despite fluorescent sensing is a reference method for the detection of a plethora of different compounds, the exploitation of this class of sensors is still limited to a few application scenarios as a result of the restricted availability of miniaturized, portable, and user-friendly devices.
Here, the smart combination of an organic photodiode (OPD), a Distributed Bragg Filter (DBR), and an organic light-emitting diode (OLED) is proven to provide a stacked device architecture capable of detecting fluorescent signals for a wide range of concentrations of “Rhodamine 700” ranging from 10-3 M to 10-5 M.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.